Finding the Fourth Proportional to 99,739,538.20, 137,687,213.72 and 57,915,456.81

Step by Step Solution

1. Step 1: Write the proportion equation
   99,739,538.20 : 137,687,213.72 = 57,915,456.81 : x
2. Step 2: Convert to fraction form
   99,739,538.20/137,687,213.72 = 57,915,456.81/x
3. Step 3: Cross multiply
   99,739,538.20x = 137,687,213.72 × 57,915,456.81
4. Step 4: Simplify right side
   99,739,538.20x = 7,974,217,879,200,323
5. Step 5: Solve for x
   x = 7,974,217,879,200,323/99,739,538.20
6. Step 6: Final answer
   x = 79,950,419.10